diff options
Diffstat (limited to 'pkg/sentry/fs/ext/disklayout/block_group.go')
| -rw-r--r-- | pkg/sentry/fs/ext/disklayout/block_group.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/pkg/sentry/fs/ext/disklayout/block_group.go b/pkg/sentry/fs/ext/disklayout/block_group.go index 32ea3d97d..ad6f4fef8 100644 --- a/pkg/sentry/fs/ext/disklayout/block_group.go +++ b/pkg/sentry/fs/ext/disklayout/block_group.go @@ -18,6 +18,16 @@ package disklayout // is split into a series of block groups. This provides an access layer to // information needed to access and use a block group. // +// Location: +// - The block group descriptor table is always placed in the blocks +// immediately after the block containing the superblock. +// - The 1st block group descriptor in the original table is in the +// (sb.FirstDataBlock() + 1)th block. +// - See SuperBlock docs to see where the block group descriptor table is +// replicated. +// - sb.BgDescSize() must be used as the block group descriptor entry size +// while reading the table from disk. +// // See https://www.kernel.org/doc/html/latest/filesystems/ext4/globals.html#block-group-descriptors. type BlockGroup interface { // InodeTable returns the absolute block number of the block containing the |